乙酸和富芳香组分对生物油电化学提质中聚合结焦的影响  

Electrochemical upgrading of bio-oil:Effect of acetic acid and aromatic-rich fraction on coke formation

作　　者：陈俊杰[1] 邓伟[1] 汪雪棚 许凯[1] 徐俊[1] 江龙[1] 苏胜[1] 胡松[1] 汪一[1] 向军[1] CHEN Junjie;DENG Wei;WANG Xuepeng;XU Kai;XU Jun;JIANG Long;SU Sheng;HU Song;WANG Yi;XIANG Jun(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学煤燃烧与低碳利用全国重点实验室,湖北武汉430074

出　　处：《能源环境保护》2024年第2期155-165,共11页Energy Environmental Protection

基　　金：国家自然科学基金优秀青年基金资助项目(52122608);国家资助博士后研究人员计划资助项目(GZC20230885)。

摘　　要：生物油是唯一的液体含碳可再生资源,因其成分复杂、热值低、酸度高、粘度大等特点,必须经过提质才能进一步利用。生物油电化学提质是一种条件温和、易于控制的新兴提质方法,但仍面临生物油聚合结焦的问题,降低了提质生物油的品质和收率。通过对含有不同浓度乙酸和富芳香组分(Aromatic-Rich Fraction,ARF)的调制生物油分别进行电化学提质实验,对电化学反应后的溶液和焦表征分析,研究了乙酸和ARF对焦产率的影响规律,探讨了乙酸和ARF对生物油聚合结焦的影响机制。结果表明,乙酸能抑制生物油聚合结焦,加入浓度1%的乙酸可降低焦产率约25%,继续增加乙酸浓度会进一步降低焦产率;而ARF则会促进生物油聚合结焦,当ARF浓度从60%升到70%时,焦产率增加了约70%,当ARF浓度升到80%后,焦产率增加了约150%。乙酸能抑制生物油中酚类物质自缩合,降低了聚合结焦反应的速率,而ARF则增强了羟醛缩合反应,提高了聚合结焦反应的速率。Bio-oil is the only liquid carbon-containing renewable resource.Due to its complex composition,low calorific value,high acidity,high viscosity,and other factors,it requires upgrading before further utilization.Electrochemical upgrading is a novel,mild and easily controllable method for bio-oil improvement,but it still faces the challenge of coking caused by bio-oil polymerization,which reduces the quality and yield of upgraded bio-oil.By conducting electrochemical upgrading experiments on modulated bio-oils containing different concentrations of acetic acid and aromatic-rich fraction(ARF),and characterizing the solutions and coke after the electrochemical reactions,the effects of acetic acid and ARF on coke yield were investigated,and the influence of acetic acid and ARF on bio-oil polymerization coking was discussed.The results showed that acetic acid could inhibit bio-oil polymerization coking.Adding 1%mass fraction of acetic acid could reduce coke yield by about 25%,and the coke yield could be further reduced as the acetic acid concentration increased.The ARF could promote bio-oil polymerization coking.When the ARF′s mass fraction increased from 60%to 70%,the coke yield increased by about 70%.When the ARF′s mass fraction increased to 80%,the coke yield increased by about 150%.Acetic acid inhibited the self-condensation of phenolic substances in bio-oil,reducing the rate of polymerization coking reaction,while ARF enhanced the hydroxyaldehyde condensation reaction,increasing the rate of polymerization coking reaction.

关 键 词：生物油 电化学 提质 结焦 乙酸 富芳香组分 

分 类 号：X705[环境科学与工程—环境工程]